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China has experienced severe hazes with high concentrations of particulate matter in recent years. The understanding of the size spectrum evolution of submicron particulate matter is critical to making efficient remediation policies to minimize the regional and global environmental impacts from hazes. During a time period of about one month, we monitored five severe haze episodes in Xi'an and four severe haze episodes in Beijing, which were characterized by two distinct kinds of aerosol mass concentration growth processes accumulative-